What exactly are you trying to achieve? Why to wrap
fo:external-graphic in fo:inline's?
Note that 'scale-to-fit' property makes sense only when used with
explicit 'width' or/and 'height' specified. Those properties define
viewport size. In your code both images actually have
width="100%" height="100%". As a result you have viewport with the
size of parent reference area (whole page in your case, I suppose) and
hence there is an overflow.
Consider following example:
<fo:external-graphic content-width="scale-to-fit"
width="25pt"
content-height="100%"
scaling="uniform"
src="url(./Ann7CnvTriP51.gif)"/>

This one will scale you image width down to 25pt (height will be
scaled proportionally).

M> I will have a look to the thread, and I try to use the solution, but I
M> always have the same error message :
M> -- {?no space for an element, trying to recover} ---
M> and I don't have the graphic in the pdf file.

>>Hello Marc,
>>
>>The short answer: you have to use 'scale-to-fit' value of
>>content-width/height attributes.
>>There was several discussion on the list regarding this topic.
>>Take a look at the posting of David Tolpin:
>>
>>http://xep.xattic.com/lists/xep-support/0376.html>>
>>It contains a code snippet that could be useful for you.
>>
>>Best regards,
>>Alexander Peshkov mailto:peshkov@renderx.com>>RenderX
>>
>>
>>M> Hello,
>>
>>M> I have a problem with graphic resizing.
>>M> In the same XML file I have small graphic and grphic too big to be on
>>M> the page.
>>M> The size can't be given by the author, because he doesn't know the
>>M> format of the PDF and the same XML is used for HTML.
>>M> I don't know how to automaticly conserve the size of the small graphic
>>M> and to force the size of the big graphic to the maximum, if I don't
>>M> give with to the 'fo:external-graphic' I have an XEP error as the
>>M> object can be in the margins.
>>
>>M> I don't find any information about that in the documentation (XEP or
>>M> XSL-FO).
>>
>>M> Thank for an idea
>>
>>M> Marc
>>
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>>
>>
>>С уважением,
>> Александр mailto:peshkov@renderx.com>>
>>
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